See the graph
Work Step by Step
We are given: $y=-2x^2-1$ Make a table of values $x=-1 \rightarrow y=-3$ $x=0 \rightarrow y=-1$ $x=1 \rightarrow y=-3$ The vertex is $(0,-1)$. It is a maximum.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.